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Weather & Climate
Great Falls, Montana, United States
Overview
Climate data and monthly weather averages for Great Falls.
Key Metrics
Annual Avg
7°C
Summer Avg
19.2°C
Winter Avg
-4.3°C
Record High
39.6°C
Record Low
-34.2°C
Annual Precipitation
473.3 mm
Avg Humidity
64%
Summer Humidity
51%
Winter Humidity
78%
Monthly Averages
| Month | High (°C) | Avg (°C) | Low (°C) | Rain (mm) | Humidity (%) | Sunshine (h) | Wind (kph) |
|---|---|---|---|---|---|---|---|
| Jan | 12.6° | -4.3° | -34.2° | 24.2 | 79% | 47 | 52.3 |
| Feb | 15.2° | -4.1° | -32.5° | 24.6 | 76% | 71 | 58.2 |
| Mar | 24.5° | 1.1° | -31.7° | 27.9 | 68% | 113 | 54.8 |
| Apr | 28.8° | 5.6° | -13.9° | 53.7 | 63% | 144 | 53 |
| May | 32.6° | 11.3° | -7.6° | 69.4 | 59% | 180 | 50.9 |
| Jun | 36.5° | 16.2° | 1.2° | 79.8 | 57% | 199 | 47.7 |
| Jul | 39.6° | 21.6° | 5.5° | 31.9 | 48% | 223 | 38.7 |
| Aug | 37.9° | 19.9° | 4.3° | 35 | 49% | 183 | 50.5 |
| Sep | 33.7° | 14° | -7.6° | 40.8 | 55% | 128 | 46.5 |
| Oct | 29.9° | 6.4° | -14.8° | 36.3 | 64% | 85 | 56.3 |
| Nov | 20.7° | 0.5° | -24.2° | 25.2 | 71% | 49 | 62.4 |
| Dec | 11.6° | -4.4° | -28.5° | 24.5 | 78% | 36 | 51.6 |
Frequently Asked Questions
Sources: NASA POWER · Last updated: 2025
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